Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d7bcc7f1598c19…

MALICIOUS

PDF

122.0 KB Created: 2021-09-20 00:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09abbad6069a9c2d28de5ec7b75d3c5a SHA-1: 2950d221b307c45fd58704808c4a29ab99355ced SHA-256: f9d7bcc7f1598c19252965fb8a145cfac9f33778a925e491ded2318393131cd2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a non-legitimate purpose related to link manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://festacontinua.it/public/file/3392394293.pdf In PDF document text
    • https://casabresciani.it/uploads/file/xijugubikukepukarig.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/46869186800.pdfIn PDF document text
    • https://soechi.id/userfiles/file/zekoludoxukamikogunetowe.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/fazadopu.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/44076286976.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/bepoxirexugodusejedof.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/dinamiwetukori.pdfIn PDF document text
    • http://falconltd.pl/cache/file/86536411320.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ca26a1133---93224267399.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/sevedadesisotinuwurugokir.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/mevukomezijagadegarisepe.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/zufipamuzewojoduxugu.pdfIn PDF document text
    • http://ks-klinika.ru/ckfinder/userfiles/files/71670874964.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/64882699389.pdfIn PDF document text
    • http://paradoxine.com/upload/files/gilunamorakuxowozos.pdfIn PDF document text
    • http://ctm.it/userfiles/file/fimen.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/debife.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161324978aed0c---dojavodamirutadiv.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/41432533256.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/98239010531.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/51796126246.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/67741885433.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/32759562862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=american+spoken+english+book+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000186fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186FE 11184 bytes
SHA-256: 44dedada420c8305f782786a6c2743ead3315c046ed665d2540dadc42b62a18c
font_02_sfnt_off0001a074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A074 22180 bytes
SHA-256: edc2093f46b8cac4b98b1cda4354e94eb30a5a8056709ad021834e5ad12ebf8f

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